Let’s talk about what’s under the tile.
Here’s the thing: when we’re putting heat under a tile, space is tight. So we lean on a 400V halogen quartz tube. Why? Because the higher voltage drops the current for the same wattage. And that means you get smaller wires and cleaner connections, especially when you’re squeezing several units into a small footprint. We use a 300mm tube that hits 2500W. That’s a lot of heat packed into a short space. The payoff? It ramps up fast and keeps the whole install slim. It’s straight resistance heating—no bulky heat exchangers getting in the way.
Built to take the heat.
The quartz envelope handles the shock of switching on and off quickly without cracking. And the halogen fill keeps the filament temperature steady over the life of the tube, so it resists the blackening that would otherwise dim the output. The R7s two-pin ceramic base is a no-fuss choice. It can handle the heat right at the ends of the tube and makes wiring straightforward. We finish it with a coating that cuts glare and keeps fingerprints and oils from creating hot spots on the quartz.
Where it shines.
These heaters were made for under-tile spots where space is tight and you need heat fast. The 400V design keeps control wiring simple and cuts voltage drop over distance, but it does mean you need a properly rated power supply and solid thermal management. Because the heat density is high, the surrounding materials—your structure and insulation—need to be chosen to handle the local temperature rise. For engineers, this setup gives predictable output, easy replacement, and a tough footprint for process heating in tight zones.